Vitamin B12 + Calcium
500µg MH3A® Formula


500µg vitamin B12 plus calcium citrate providing optimal absorption. Vitamin B12 as MH3A® formula with all three natural cobalamins and five different B12 active ingredients (methyl-, hydroxo- and adenosylcobalamin), bioactive, 100% vegan, without additives, GMO-free, produced in the EU. 60 capsules
  • MH3A® formula: harmonious mixture of 5 premium B12 active substances
  • Plus calcium citrate for optimal absorption
  • Bioactive vitamin B12 in the form of methylcobalamin, hydroxocobalamin and adenosylcobalamin
  • All three natural and bioactive forms of B12- 2 active coenzyme forms with high bioavailability
  • Vitamin B12 for homocysteine metabolism, emotional function, immune system, the central nervous system
  • Vitamin B12 for the production of red blood cells, reduction of tiredness and fatigue
  • Calcium for blood clotting, muscle function, signal transmission between nerve cells, digestive enzymes, bones and teeth.
  • Vitamin B12 and calcium for energy metabolism and cell division and specialisation
60 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€647.83 / 1kg
In stock

Premium Bioactive Ingredients

  • MH3A® formula: harmonious mixture of 5 premium B12 active substances
  • Bioactive vitamin B12 in the form of methylcobalamin, hydroxocobalamin and adenosylcobalamin
  • 2 active coenzyme forms with high bioavailability
  • 5 different B12 active substances
  • Premium B12 ingredients produced in the EU
  • Highly bioavailable calcium citrate for improved absorption
  • 100% from natural source
  • 500µg bioactive vitamin B12 per capsule

How are we different?

Not all forms of vitamin B12 show the same level of efficacy. Conventional supplements often contain only synthetic forms of vitamin B12. Before they can be utilised, these must first be converted to their biologically active forms in the body. Sunday Natural Vitamin B12 MH3A® provides the full spectrum of bioactive and natural forms of vitamin B12.

Conventional vitamin B12 supplements usually provide only 1 active ingredient. However, several active forms occur in our bodies and in natural foods. All forms show different effects and enter the body partly through different metabolic pathways.

As a pioneer in B12 products, our innovative Vitamin B12 MH3A® formula supplies B12 in the same form as it occurs in natural foods; as a mixture of all 3 natural forms in a highly active complex. This is because each form plays a different role within the body. Our MH3A® formula contains all 3 in a balanced ratio and thus delivers an ideal and well-rounded supply of vitamin B12, since all forms are naturally found together. The majority of formulas on the market contain only 1 of 3 vitamin B12 active ingredients (methylcobalamine, hydroxocobalamin or adenosylcobalamin).

The absorption of vitamin B12 via the "intrinsic factor" transport molecule is a calcium-dependent process whereby calcium plays the role of a necessary cofactor. Our Vitamin B12 + Calcium therefore supports the absorption of vitamin B12 in the intestines, thus optimising its bioavailability.

For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass jars.


  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


Vitamin B12 (Cobalamin)

Vitamin B12 performs a variety of important functions in the body. Among other things, it can help reduce tiredness and fatigue and maintain normal energy metabolism. It contributes to normal functioning of the psyche and immune and nervous systems, it supports the formation of red blood cells and is conducive to normal homocysteine metabolism. Additionally, the body needs vitamin B12 for cell division. Vitamin B12 acts in the body as a so-called coenzyme. This means it us required for certain enzymes in our body to perform their tasks. The related reactions are directly dependent on a sufficient supply of vitamin B12 and cannot take place without the vitamin.

Vitamin B12 MH3A® Formula

Vitamin B12 exists in different chemical forms, each with different functions within the body. The natural forms of vitamin B12 that can be readily absorbed by the body are described as "bioactive coenzymes". Synthetic forms of Vitamin B12 such as cyanocobalamin must be first converted into a natural form by the body in order to be effective, which is why we use naturally bioactive forms of Vitamin B12 that the body can directly use.

Methylcobalamin and adenosylcobalamin are the bioactive coenzyme forms of vitamin B12. The body requires them for many different metabolic processes. Methylcobalamin plays a role in the methylation cycle within the cell plasma, thus influencing various bodily processes from blood cell synthesis to psyche to the functioning of the nervous system.  Adenosylcobalamin, in contrast, takes effect in the mitochondria, the "powerhouse" of the cell. There it plays a role in the citrate cycle, the central metabolic cycle for producing energy. Hydroxocobalamin is another natural form of vitamin B12 that can be found in many food products. A large quantity of vitamin B12 found in the blood exists in the form of hydroxocobalamin, which binds particularly well to vitamin B12 transport molecules and can thus be easily retained in the body. It is also the B12 vitamin with the best depository properties. Hydroxocobalamin can be easily converted by the body into the active coenzyme forms as needed.

Health Benefits of Vitamin B12 According to the European Food Safety Authority (EFSA)

Vitamin B12 contributes to:

  • Normal energy-yielding metabolism
  • Normal functioning of the nervous system
  • Normal homocysteine metabolism
  • Normal mental function
  • Normal formation of red blood cells
  • Normal function of the immune system
  • The reduction of tiredness and fatigue

and vitamin B12 has a role in the process of cell division.

Health Benefits of Calcium According to the European Food Safety Authority (EFSA)


  • Contributes to normal blood clotting
  • Contributes to normal energy metabolism
  • Contributes to normal muscle function
  • Contributes to normal signal transmission between nerve cells
  • Contributes to normal function of digestive enzymes
  • Has a function in cell division and specialisation
  • Is needed for the maintenance of normal bones and teeth


Recommended Dosage

Take 1-2 capsules with 200ml water daily 30 minutes before a meal.

Daily Requirements

The German Nutrition Society (DGE) recommends a minimum intake of 3µg vitamin B12 per day for adults.

B12 Intake

The human body can only absorb small quantities of vitamin B12 through food and supplements. Only approximately 1-2µg vitamin B12 per dosage can be actively absorbed through the special "intrinsic factor" protein and a further 1% of the dosage is absorbed through passive diffusion. The total supplement intake is estimated based on the combination of these two factors.

By staggering the intake of vitamin B, absorption via the intrinsic factor is possible twice a day. Two capsules of Sunday Natural Vitamin B12 + Calcium MH3A® Formula 500µg ensure an intake 6-7µg Vitamin B12 per capsule.

Food Supplement

Do not exceed recommended daily intake. Nutritional supplements do not replace a balanced and varied diet. Keep away from children.


Vitamin B12 is sensitive to light. For an optimal durability of the bioactive B12 forms, keep the product in a dark, cold and dry place. Keep away from direct sunlight and heat.


Ingredients: Calcium Citrate, Vitamin B12 (in the form of Methylcobalamin, Hydroxocobalamin, and Adenosylcobalamin).

Capsule shells: Hydroxypropyl Methylcellulose.

Ingredients per Daily Dose (2 Capsules)   % NRV*
Vitamin B12 1,000µg 40,000
    of which methylcobalamin   333µg   13,333
    of which hydroxocobalamin   333µg   13,333
    of which adenosylcobalamin   333µg   13,333
Calcium 147mg 18

* % Nutrient Reference Value


All eight essential B vitamins work together. Numerous metabolic processes in the body require them; they can only achieve optimal functionality if each vitamin is in sufficient supply. Therefore, in many cases, it makes sense to supplement these vitamins together.

Product Details

German Central Pharmaceutical Number (PZN): 16161886
Origin All ingredients are from the EU
In-house production in Europe, bottling and encapsulation in the EU according to HACCP, GMP / ISO 22000:2018 standards
Finished products packaged in amber glass jars, and stored in non-toxic containers
Shipping in mineral oil-free boxes
Capsule Shells Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
To Reuse Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap

Laboratory Tests

The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

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